Alector, Inc.

ALEC

Exchange: Nasdaq
Industry: Biological Products, (No Diagnostic Substances)
SEC CIK: 0001653087

SEC filings (opens in a new tab)

In the last 90 days, Alector, Inc. insiders filed 0 open-market purchases and 3 sales; 140 institutions reported holding it in 13F filings for Q2 2026, worth $183.4M in total; no superinvestor holds it.

Q3 2025 vs. Q2 2025

How the institutions holding Alector, Inc. changed between Q2 2025 and Q3 2025.

All holders in Q3 2025 All holders in Q2 2025

13F holders of ALEC: Q2 2025 compared with Q3 2025
Measure	Q2 2025	Q3 2025	Change
Holders	136	149	+13
Shares	70.5M	74.7M	+4.24M (+6.0%)
Value	$98.7M	$221.2M	+$122.5M (+124.1%)

New holders (25)

Institutions that held Alector, Inc. at the end of Q3 2025 but not at the end of Q2 2025.

Institutions new to ALEC in Q3 2025
Institution	Shares	Value	% of portfolio
RTW Investments, LP	6,990,806	$20.7M	0.25%
683 Capital Management, LLC	1,000,000	$2.96M	0.27%
Marshall Wace, LLP	151,643	$448.9K	0.00%
Simplex Trading, LLC	100,944	$298.0K	0.01%
Artia Global Partners LP	71,029	$210.2K	0.04%
HRT Financial LP	60,164	$178.0K	0.00%
MetLife Investment Management	28,820	$85.3K	0.00%
Group One Trading, L.P.	22,321	$66.1K	0.00%
American Century Companies Inc	20,481	$60.6K	0.00%
Creative Planning	15,721	$46.5K	0.00%
Engineers Gate Manager LP	14,493	$42.9K	0.00%
Hamilton Lane Advisors LLC	14,402	$42.6K	0.02%
Wealth Enhancement Advisory Services, LLC	11,970	$36.7K	0.00%
Belvedere Trading LLC	10,486	$31.0K	0.00%
Hershey Trust Co	10,286	$30.4K	0.00%
SVB Capital Management, LLC	10,286	$30.4K	0.10%
Lexington Partners L.P.	10,108	$29.9K	0.01%
Point72 (DIFC) Ltd	9,807	$29.0K	0.00%
California State Teachers Retirement System	4,963	$14.7K	0.00%
SRS Capital Advisors, Inc.	3,190	$9.44K	0.00%
Rockefeller Capital Management L.P.	1,367	$4.05K	0.00%
Optiver Holding B.V.	1,018	$3.01K	0.00%
Point72 Asset Management, L.P.	542	$1.60K	0.00%
Advisory Services Network, LLC	271	$803	0.00%
Avion Wealth	336	$0	0.00%

Sold out (12)

Institutions that held Alector, Inc. at the end of Q2 2025 and filed for Q3 2025 without it.

Institutions that sold out of ALEC in Q3 2025
Institution	Shares, Q2 2025	Value, Q2 2025
ADAR1 Capital Management, LLC	1,723,526	$2.41M
Sio Capital Management, LLC	845,531	$1.18M
Walleye Capital LLC	266,204	$372.7K
State of Wyoming	223,092	$312.3K
Gsa Capital Partners LLP	150,669	$211.0K
Susquehanna Fundamental Investments, LLC	70,778	$99.1K
Algert Global LLC	44,460	$62.2K
State Board of Administration of Florida Retirement System	25,570	$35.8K
Shell Asset Management Co	13,887	$19.0K
US Bancorp	12,427	$17.4K
Raymond James Financial Inc	1,479	$2.07K
Skopos Labs, Inc.	601	$842